Centering.



J. B. BLAW. v

OENTERING.

APPLICATION FILED JAN. 3, 1911.

Patented J an. 26, 191

Z SHEETS-SHEET 1.

WITNESSES IHMWEMTOIR means for supporting and positionin UNITED STATES, r

'i'AcoB 2B. BLAw,'oF PITTSBURGH, PENNSYLVANIA, assieiioa To BLAW GOLLAPSIJBLE STEEL CENTEBING 00., or PITTSBURGH, rnniisrnvama, a con'roaaTron or new JERSEY.

CENTERING.

- Application filed January 3, 1911. Serial No. 600,538. I

To all whom it may concern:

Be it known that-I, JACOB B. BLAW, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Centering, of which the following is a specification.

The invention relates to the centering or forms employed in connection with concrete, and particularly to the box typefor the formation of culverts, conduits and the like, and to the wall construction whether employed in a form of the box type or in any other relation. The invention has for its primary objects; the provision of an 'im-' proved form or mold of the inverted U type; the provision of a mold wherein the walls are madein sections with stifiening means for detachably securing a series of the sec? tions together; the provision of a sectional mold-which can be readily changed in dimensions so that the same sections may be used for different sizes of molds to suit conditions; the provision of improved means for securing a plurality of detachable sections of a retaining'wall rigidly in assembled position; the provision in a mold of the inverted U type of improved means whereby the mold may be collapsed; the provision in a mold of the inverted U type of improvpld t e top of the mold; and the provision 0 improved bracing means for the mold. Certain embodiments of the invention are illustrated in the accompanying drawings, where- Figure 1 is a section through a mold or form of the box type embodying the invention, Fig. 2 is a side elevation of the form of Fig. 1, with the lagging broken away to disclose certain of the parts in side elevation and section, Fig. 3 is a perspective view on an enlarged scale of several of the lagging sections employed, Fig. 4 is an enlarged section on the line IVIV of Fig. 3, Fig. '5 is a section through a modified form of connection, and Fig. 6 is a face view of a retaining wall supplied with the form of connection shown in section in Fig. 5.

As shown in Fig. 1 the mold or form comthe connecting connecting member ,11 mounted upon the corner braces 8; and jacks 12 mounted upon posed' of plates of the same size and shape.

as the plates 13. The side walls 1 and 2 are connectedto the top wall by means of the sheet metal corner plates 14, which plates serve as a yielding connection whereby the side walls 1 and '2 may be collapsed inwardly. Each of the plates 13 (Fig. 3) has riveted to its side edges the stifi'ening angles 15- and to its end edges the stilfening angles 16. The end angles on the plates abut as indicated in Fig.3, and the plates are rigidly secured together and stiffened by means of the rib 4, which rib, in the construction illustrated consists; of a member U shaped in cross section, which is secured to the flanges of theangles 16 by means of the bolts 17. These ribs 4 constitute the only means of connection between the plates constituting the side walls 1 and 2. The construction of the top wall 3 is substantially the same as that of the side Walls 1 and 2, the ribs 5 being of'similar construction and differing only in that the ends are slightly curved as indicated in Fig. 1.

It will be seen that by the use of the sectional construction involving the plates 13 similar in shape and'relatively of small size, an desired size of form can be secured, epending upon the number of sections or plate 13 used in building up the sides and top of the form, so that the necessity of carrying in stock the luralityof different sized forms is avoided? Each of" the plates 13 is very stiif and rigid because of the angles 15 and 16 used at the edges thereof, and the ribs 4 which cross the joints in the plate serve not only to secure all of the plates together, but also serve to add rigidity .to the entire structure. At the same time the structure is such that it may bereadily disassembled, and when disassembled may be shipped in very compact form.

The jacks 12 mounted upon the transverse beam 11 serve to maintain the top wall 3 rigidly in osition, and also serve to exactly position such wall intermediate its side edges. The bolt and slot connections between the member 11 and the corner 11s Patented Jan. as, rare.

member 11 for supporting.

braces 8-8 are provided in order to permit the corner braces to move toward each other as the side walls 1 and 2 are collapsed.

Prior to collapsing the side walls by means of the turn-buckles 9 and 10, the wedges 19 are knocked out, so that the side walls will have an opportunity to move downward during the collapsing, such downward movement being necessitated because of the stiliening braces 8-8 which tendto force the top wall 3 of the form upward as the side walls are carried inward toward each other. In positioning themold in the first instance it is brought to, its approximately proper size, and the wedges 19 driveninto place lifting it to the proper height. The turn-buckles 9 and 10 and the jacks 12 can then-be adjusted to exactly position the walls.

Another form of connectionv is illustrated in Figs. 5 and 6, a two piece rib consistin of.the plates 20 and 21 being substitute for the rib portion 4: as indicated in Fig. 4. These plates 20 and 21 are secured together by means of the bolts 22, the spacers 23 being riveted to the plates 20 and 21 in the manner indicated in Fig. 5. The edges of theplates 20 and 21 are secured to theflanges of the angles 16 by means of the bolts 24. Various other expedients might be obviousl forms of ribs illustrated, the only requirement being that the rib extend across a plurality of plates so as to support the joints between the plates, and thatsuch ribs be secured rigidly but detachably to the flanges of the sections mounted upon the plates 13.

Having thus described my invention and.

illustrated its use what I claim as new and desire to secure by Letters Patent is. the following 1. A mold comprising a top wall of sheet metal rovided with a transverse stifiening rib, si e walls of sheet metal each provided with a vertical stiifening rib and connected with the top wall so that the .side walls adopted in lieu of the two may be swung inward, corner braces 'secured to the said ribs on the top and side walls, a transverse connecting member mounted on the corner braces, and means upon the connecting member for supporting the top'wall.

2. A mold comprising a top wall of sheet metal provided with a transverse stiflenin rib, sidewalls of sheet'metal each provide with a vertical stiffening rib and connected with the top wall so that the side walls may be swung-inward, corner braces secured to the said ribs on the top and side walls, a

transverse connecting member mounted on the corner braces, and adjustable supporting means for the top wall mounted on the said connecting member.

3. A mold comprising a top wall of sheet metal provided with a transverse stiffening rib,.side walls of sheet metal each provided with a vertical stiifening rib and connected with the top wall' so that the sidewalls maybe swung inward, co'rner braces secured tothe said ribs on the top'and side walls, a transverse connecting brace having slidable engagement with-the corner braces, and adjustable supporting means for the top wall mounted on the said transverse brace.

4. A mold comprising-a top wall of sheet metal provided with a transverse stiffening rib, side wallsof sheet metal each provided with a vertical stiffening rib and connected with the top wall by a curved sheet metal corner plate, corner braces secured to the said ribs on the top and side walls, a transverse connectingbrace between the corner means for, the top braces, and ad ustin transverse brace.

wall mounted on suc In testimony whereof I have hereunto.

signed my name in the presence of the two 

